242 results about "Surface measurement" patented technology

The invention relates to the technical field of precise geometric quantity measurement, and discloses an electronic component size and contour automatic metering method, which comprises the following steps: calculating a nominal truncation phase distribution diagram of a to-be-measured electronic component by using a virtual projection imaging model, controlling a projection unit to project a single-frequency sine stripe grating to the electronic component and collecting a deformed stripe image, calculating the gradient of the modulation degree distribution map and extracting edge contour features to solve the actual pose of the assembly; performing modulo 2pi differential operation on the nominal and actually measured truncated phase distribution maps, and eliminating high-gradient artifacts by using an edge mask to generate a phase residual map; and converting the phase residual image into a height deviation distribution diagram according to the phase height mapping relation, and by constructing a phase domain differential metering channel, the phase unwrapping ambiguity in discontinuous surface measurement is avoided.

The invention relates to the technical field of surface measurement, in particular to a road surface flatness rapid detection method based on a laser radar, which comprises the following steps: collecting vehicle attitude data to form a three-dimensional vector, mapping laser data to a space coordinate system, identifying a projection difference adjustment track, detecting a disturbance generation distribution area, and transversely distributing a translation direction line. Uniformly projecting to construct a reference line, extracting an echo and time index recombination time sequence segment, analyzing a point number trend to screen a stable segment, and extracting symmetric points to compare an included angle to generate a closed zone. According to the method, the attitude vectors of the vehicle in rolling, pitching and yawing states are obtained, the laser echo distance measurement data are mapped to the absolute space coordinate system, and the included angle difference between the distance measurement direction and the ground direction is accurately calculated, so that the space matching precision of a measurement path is remarkably improved, and a longitudinal section analysis result is closer to a real road state; and the space integrity, the track smoothness and the section structure rationality of the whole measurement process are comprehensively optimized.

A Beidou / GNSS-based real-time high-precision sea surface measurement method and a buoy, wherein by using free-to-use broadcast ephemeris freely broadcast by GNSS satellites, precise point positioning of China's Beidou satellites, and other high-precision service space signals, real-time centimeter-level element information comprising time, longitude, latitude, water level, wave height, wave period, wave direction, sea surface current velocity and direction, atmospheric water vapor content, and the like can be directly obtained. The information can be stored locally in a buoy or transmitted back by communication, and is suitable for real-time high-precision sea surface measurements in offshore and far-sea scenarios.

The present invention belongs to the technical field related to precision measurement, and discloses an orthogonal line spectrum confocal scanning profile measurement sensor and an anti-vibration method. The sensor includes a light source module, and first and second direction linear dispersion confocal imaging modules. The light source module is used to generate two beams of orthogonal collimated white light. The two beams of orthogonal collimated white light enter the first and second direction linear dispersion confocal imaging modules respectively, thereby scanning the surface of the sample to be measured and imaging, thereby obtaining the surface profile of the sample to be measured at two orthogonal angles. The first direction linear dispersion confocal imaging module includes a first linear dispersion confocal structure, a second slit, and a first imaging unit. The second direction linear dispersion confocal imaging module includes a second linear dispersion confocal structure, a third slit, and a second imaging unit. The directions of the second and third slits are respectively the same as the directions of the two orthogonal slits in the first slit. Through the present invention, the problem of vibration affecting measurement accuracy during line scanning surface measurement is solved.

The invention relates to the technical field of geophysical exploration, in particular to an optimal selection method for an oil-gas structure favorable area of a low-exploration-degree area of a mountain-front thrust zone. The method comprises the following steps: selecting an oil and gas prospective area, carrying out surface geological survey based on a regional geological map, compiling a surface fracture structure outline map and determining a main structure trend; performing wavelet decomposition on the gravity data to determine a substrate fracture adaptation result; deploying a magnetotelluric sounding profile in a direction perpendicular to the structure to obtain an electrical model, and compiling a substrate fracture diagram; deploying a sounding profile and a wide-line two-dimensional seismic profile fixed low-resistance strip in a parallel structure trend; a base depth map is calibrated, and a hidden strike-slip fracture layout is tracked; performing mesh generation to calculate indexes, performing standardized assignment, and performing mean value gridding; and preferably selecting an oil-gas structure favorable area by combining a drilling gas content fixed boundary. By adopting the ground measurement and multi-geophysical technology, the method is low in cost, simple to operate, high in efficiency and adaptive to a low exploration area, the optimization accuracy is improved, and powerful technical support is provided for optimization of an oil-gas exploration target area.

The invention discloses a novel symmetric iteration nearest point cloud registration calculation method for quality detection, and the calculation method comprises the steps: setting a point set and a point set in a three-dimensional space, carrying out the registration of a point set P and a point set Q, so as to solve a six-degree-of-freedom rigid body transformation matrix, and carrying out the registration of the point set P and the point set Q; the six-degree-of-freedom rigid body transformation matrix comprises a three-degree-of-freedom rotation matrix R and a three-degree-of-freedom translation vector t; a weighted point-surface model is constructed, and a symmetric iteration nearest point objective function based on weighted point-surface measurement and an adaptive robust loss function is constructed based on the weighted point-surface model; the calculation of the symmetric iteration nearest point objective function based on the weighted point-surface measurement and the adaptive robust loss function comprises the step of alternately executing a corresponding point updating step and a registration step until a convergence condition is met.

The invention relates to the technical field of underground medium density inversion, in particular to an underground medium density inversion method and system based on high-precision microgravity, and the method comprises the steps: obtaining the gravity data of each observation point in an underground medium density inversion ground surface measurement region; calculating a superposition abnormal value of each gravity subsequence of each observation point, extracting a superposition characteristic value of each modal component, obtaining the superposition interference confidence of each gravity subsequence of each observation point, obtaining the superposition influence persistence of each observation point, adjusting the wavelet threshold of the wavelet transform of the gravity data on each observation point, and calculating the superposition abnormal value of each gravity subsequence of each observation point. And correcting the gravity data of each observation point after denoising processing to extract Bouguer gravity anomaly of each observation point, and obtaining an inversion result of the underground medium density through a Parker-Oldenburg density interface inversion algorithm. According to the method, the underground medium density can be effectively and accurately inverted through the high-precision microgravity data.

The invention relates to the field of jaw crusher feeding. According to the material level closed-loop control method for the jaw crusher, a support 2 extending in the direction of the jaw crusher 4 is installed on the side portion of a draw shaft 1, and a radar material level indicator 3 which can completely measure the surface of mineral aggregate in an inner cavity of the jaw crusher 4 and has a surface measurement function is installed on the support above an opening of the jaw crusher 4. The heavy plate ore feeder 5 is connected with a discharging port in the bottom of the draw shaft 1 and a feeding port of an inner cavity of the jaw crusher 4, and the heavy plate ore feeder 5 and the radar level gage 3 are in electric signal connection with the PLC. According to the implementation of the invention, the accuracy of measuring the material level in the machine cavity of the jaw crusher can be improved, and the material level signal is used for performing closed-loop control on the frequency (variable frequency motor) of the heavy plate feeder, so that the full feeding of the crusher is realized, the mineral crushing granularity is improved, the entering of strip-shaped ores into the next process is reduced, and the unattended operation of the crusher is realized.

The invention relates to a laser interference surface type measurement method using random mechanical disturbance for resolving. The method comprises the following steps: acquiring an interference image of a measured element by using a surface type measurement device based on laser interference; applying random mechanical disturbance to the surface type measuring device to cause the change of the relative pose between the reference mirror and the measured element so as to acquire N frames of interference images in different disturbance states; and processing the acquired interference images through a natural phase decoding algorithm to obtain the surface topography of the measured element. Compared with the prior art, high-precision measurement of the surface type of the measured element can be realized without vibration isolation equipment and a high-precision phase shifter, and the method has the advantages of low cost, low system complexity and high adaptability.

The invention discloses a three-coordinate measuring machine based on special-shaped surface measurement. An upper working surface where a working table is located is used for bearing a to-be-measured piece; the measuring mechanism is arranged on the moving portal frame, the moving portal frame is made to move on the workbench, and a to-be-measured piece is measured through the measuring mechanism. A measuring head of the measuring mechanism is arranged at the front end portion where the first movement assembly is located, meanwhile, a first air bag pushing piece is arranged at the rear end portion where the first movement assembly is located, and the first air bag pushing piece is inflated and deflated to be matched with a measuring head piece at the front end portion to synchronously achieve axial pivoting movement. And the second movement assembly is located above the first movement assembly, so that the pivoting movement of the first movement assembly and the second movement assembly drives the measuring head piece to move in the whole space direction, and the full-angle scanning measurement of the to-be-measured piece by the measuring head piece is formed. The whole device can realize high-precision measurement of small-size measurement pieces, and the measurement efficiency is improved.

The invention discloses a method for measuring the number of layers of a two-dimensional material by utilizing Goos-Haenchen displacement, which comprises the following steps: establishing a Goos-Haenchen displacement theoretical database when a horizontal polarized light beam is reflected on the surfaces of the two-dimensional materials with different layers at different incident angles according to a theoretical relation model of the two-dimensional materials with different layers and the Goos-Haenchen displacement; enabling the horizontal polarization incident light beam to be incident to the surface of the measured two-dimensional material at a certain incident angle; measuring Goos-Hanchen shift generated by the reflected light beam under the condition; sequentially changing the incident angles to obtain a group of Goos-Hanchen shift measurement data under different incident angles; and comparing and analyzing the measured data with theoretical data in a Goos-Hanchen shift theory database to obtain the number of layers of the measured two-dimensional material. Compared with a traditional two-dimensional material layer number measuring method, such as a Raman spectrum method, an atomic force microscopy method and a transmission electron microscope method, the method is easy to operate and high in measuring efficiency, does not damage a sample and has a good application prospect.

The invention relates to a method for interferometric surface measurement of a test specimen, a computer-generated hologram (CGH) and an interferometric test arrangement. In a method according to the invention, an interferometric superposition of a test wave directed by a CGH (120, 220, 320, 410, 420, 430, 510) onto the test piece (140, 240, 340, 540) and reflected therefrom is carried out with a reference wave not reflected at the test piece, wherein, based on a further interferometric superposition of light reflected at at least one Littrow structure (122, 222, 322, 412, 422, 432, 512) of the CGH with light reflected at a reference surface, a contribution to the optical effect of the CGH caused by a deformation present at the CGH is determined, and wherein a determination of the fit of the test piece (140, 240, 340, 540) is carried out taking this contribution into account.

The invention relates to a thin-wall part profile measuring system and method, and the system comprises a workpiece table which is used for placing a to-be-measured thin-wall part; the positive view angle data acquisition subsystem is used for acquiring positive view angle morphology data of the to-be-measured thin-walled workpiece; the anti-view-angle data acquisition subsystem is used for acquiring anti-view-angle morphology data of the to-be-measured thin-walled workpiece; the three-dimensional calibration plate is used for calibrating the relative positions of the positive view angle data acquisition subsystem and the negative view angle data acquisition subsystem; and the upper computer is used for controlling time-sharing triggering of the positive view angle data acquisition subsystem and the negative view angle data acquisition subsystem to obtain positive view angle morphology data and negative view angle morphology data, splicing the positive view angle morphology data and the negative view angle morphology data, and obtaining the three-dimensional reconstruction morphology of the to-be-measured thin-walled workpiece. Compared with the prior art, the method has the advantages of high measurement precision, low cost, high practicability and the like.

The application belongs to the technical field of three-dimensional measurement, and particularly discloses a metal surface measurement method and system based on photometric stereo and binocular structured light. The method comprises the following steps: acquiring original depth point cloud of a mirror surface region of a surface to be measured by using a binocular camera; acquiring complete normal vector data of the surface to be measured by using a photometric stereo method; and fusing the original depth point cloud and the normal vector data to calculate surface point cloud of the surface to be measured. The measurement data of the binocular structured light and the near-field photometric stereo are combined, the missing measurement data of the metal surface caused by the mirror reflection is complemented, the mutual fusion of the height data and the normal vector data is utilized, and the accuracy of surface reconstruction is improved.

The invention discloses hot galvanizing furnace nose wallboard spraying equipment, and relates to the field of electric arc spraying, the hot galvanizing furnace nose wallboard spraying equipment comprises a wallboard clamping device, a three-axis positioning device located on one side of the wallboard clamping device, and an electric arc spraying device and a plate surface measuring device which are symmetrically arranged at the execution end of the three-axis positioning device. The spraying equipment can automatically plan and realize intermittent jumping spraying, and the risk of microcracks of a coating due to thermal stress is effectively avoided; according to the scheme, a control center serves as a core, wall plate clamping, three-axis positioning, curved surface measuring and electric arc spraying devices are dispatched in a unified mode, and whole-course automatic operation from plate body clamping, posture correction, contour scanning to final spraying is achieved.

The present invention discloses a method for measuring, locating, and inspecting a semi-ellipsoidal surface for a containment bottom head, comprising the following steps: Step 1: directly measuring the vertical distance R from the inspection point to the center at the center of the nuclear island; alternatively, measuring the three-dimensional measured data (X, Y, Z) of the inspection point at any position and then calculating the vertical distance R from the inspection point to the center; Step 2: calculating the vertical distance L from the inspection point to the major semi-axis of the ellipsoid based on the vertical distance R from the inspection point to the center; and Step 3: calculating the elevation deviation ΔH of the inspection point. This method can quickly and intuitively determine whether the reinforcement construction at the bottom of the semi-ellipsoid meets the requirements, and can quickly provide the concrete pouring elevation of the semi-ellipsoid bottom surface and inspect whether the poured layer is qualified at the construction site.

This invention discloses a method for quality assessment of propeller blades based on regional difference partitioning. The steps are as follows: triangulate the initial surface of the propeller CAD model and extract the vertex set and its neighborhood feature set; analyze the geometric topology information of the vertex set's neighborhood to calculate vertex curvature features and extract seed point sets; calculate the surface vertex feature voting attributes based on the vertex set; perform regional energy clustering segmentation based on feature voting based on the seed point set; plan local measurement points based on the surface measurement area; perform chord tolerance sampling on each measurement point set to extract the locally optimal registration point set; perform nonlinear region accuracy hierarchical registration based on the locally optimal measurement point set and the vertex set; perform quality assessment based on propeller measurement standards according to the registration results; and output processing guidance data in a tabular format based on the quality assessment results. This invention solves the problems of insufficient measurement point description, low registration accuracy, and poor adaptability in the current propeller blade surface quality assessment stage caused by regional surface shape differences.

The invention provides a double-state interference morphology measurement method and system for a discontinuous precision surface, and belongs to the technical field of optical precision measurement. Based on a Fizeau interferometer, interference images in a focusing state and an out-of-focus state are respectively acquired, two-dimensional structure information and height information of a sample with a discontinuous precise surface are respectively extracted, and two-state data fusion is carried out, so that three-dimensional morphology reconstruction is realized. The method breaks through the limitation of the optical diffraction limit on the resolution, avoids the failure problem of a traditional phase unwrapping algorithm at a discontinuous boundary, remarkably enhances the environmental interference resistance, improves the calculation efficiency, is suitable for high-precision surface measurement of a vacuum chuck and the like with a large number of discontinuous characteristics, and has a wide application prospect. And a reliable solution is provided for high-end manufacturing quality control.

The invention relates to an automatic probe focal length measurement system and method. A measurement system for focal length measurement of an optical device includes: a translation stage including a base and a platform configured to be driven by a linear actuator to translate in a linear motion relative to each other in an automatic manner; a reference material disposed on the translation stage and having a surface opposite the optical device to be measured; a measuring device configured to automatically measure a gap between a surface of the reference material and a distal tip of the optical device; a spectrometer in optical communication with the optics; and a controller configured to operate the translation stage, the measurement device, and the spectrometer, and determine a focal length of the optical device based on a spectral characteristic of the measurement spectrum and based on a final gap between a surface of the reference material and a distal tip of the optical device when the spectral characteristic is determined.

The invention relates to a method for measuring an ablated surface of a reentry capsule based on three-dimensional scanning, solves the problem of measuring the ablated surface of the reentry capsule, and belongs to the technical field of three-dimensional scanning. According to the method, a three-dimensional scanning measurement unit composed of a handheld laser tracker and a visual target is adopted, 360-degree surface ablation morphology data of the reentry capsule are spliced in a unified space reference based on a structured light scanning global positioning splicing technology, and a digital stereoscopic model of the reentry capsule is constructed; and extracting a theoretical three-dimensional model of the reentry capsule, positioning the scanning point cloud of the reentry capsule structure to the theoretical three-dimensional model of the reentry capsule structure through profile fitting, and realizing measurement of the ablation surface of the reentry capsule structure based on point cloud comparison.

This invention provides a three-dimensional measurement method for the surface of a moving object on a production line based on phase-shifting profilometry. Employing a three-dimensional vision measurement system composed of a projector and a camera, and based on the measurement principle of phase-shifting profilometry, the method analyzes the phase error caused by the motion of the measured object and proposes a three-dimensional measurement method for the surface of a moving object that does not require phase error correction. By setting the installation position and angle of the projector and camera, the phase encoding direction in the projected stripe pattern is perpendicular to the direction of motion of the measured object, thereby eliminating the phase error caused by motion. This allows the three-dimensional surface measurement results of the measured object under motion conditions to essentially achieve the measurement accuracy of the measured object under static conditions, realizing high-precision online real-time measurement of the surface three-dimensional morphology of moving objects on actual production lines.

The invention relates to the technical field of optical precision measurement, in particular to a flexible multi-module expandable optical measurement and detection device, which comprises a multi-camera module, a calibration object setting module, a threshold setting module, a calibration module, an image processing module and a measurement calculation module, and is characterized in that the multi-camera module which can be freely arranged is utilized to realize flexible expansion of a hardware level; and through cooperative judgment of the threshold setting module and the calibration object setting module, the calibration module is driven to intelligently select an optimal calibration strategy: efficient hand-eye calibration is adopted for a conventional baseline, a laser tracker is adopted for direct calibration for a large-size non-public field of view, and a three-dimensional standard part is adopted for spatial parameter joint optimization for different-plane measurement. The problems that traditional contact type measurement is poor in flexibility and high in cost, and a fixed visual system is difficult to adapt to a large base line and a complex space relation are solved, and efficient and universal measurement of the size and form and location tolerance of a complex workpiece is finally achieved while high precision is guaranteed.

The invention discloses a cylindrical battery measurement method based on machine vision, which comprises a double-line scanning correlation system, the double-line scanning correlation system comprises a top surface camera and a bottom surface camera, and the measurement method comprises the following steps: S100, the top surface camera collects a cylindrical battery top surface depth map, and the bottom surface camera collects a cylindrical battery bottom surface depth map; s200, intercepting a point set of a predetermined area of the top surface of the cylindrical battery as a top surface measurement point cloud, and intercepting a point set of a predetermined area of the bottom surface as a bottom surface measurement point cloud; s300, importing a predetermined calibration matrix T, and transforming the top surface measurement point cloud and the bottom surface measurement point cloud into the same coordinate system; and S400, respectively fitting the plane equation of the top surface measurement point cloud and the plane equation of the bottom surface measurement point cloud in the same coordinate system to calculate the distance between the top surface and the bottom surface so as to obtain the height dimension of the cylindrical battery. Manual direct measurement is avoided, measurement is achieved through computer vision, and the measurement reliability is improved.

The application provides a large-batch reflective plane surface automatic measurement method, and relates to the technical field of surface measurement, which comprises the following steps: constructing a binocular phase deflection measurement system, collecting multiple phase shift fringe images of a plurality of to-be-measured parts based on the binocular phase deflection measurement system; respectively performing phase calculation on the collected fringe images to determine the position corresponding relationship between the camera pixel points and the screen pixel points of the two cameras; extracting the corresponding effective areas of the plurality of to-be-measured parts according to the fringe change conditions of the fringe images collected by the two cameras; establishing the corresponding relationship between the effective areas and the to-be-measured parts in the two cameras according to the constraints of the polar lines and normal vectors, fitting the predetermined positioning plane of the to-be-measured parts based on binocular vision; performing calculation based on the predetermined positioning plane to obtain the normal vector direction of the surface of the to-be-measured part, and integrating and calculating the surface shape according to the normal vector direction of the surface of the to-be-measured part. The application effectively solves the demand of large-batch detection of the surface shape of the reflective plane device.

The present invention relates to a method (100) for painting a surface (50) of an object using a robot system (1), the robot system comprising a painting head (11), wherein the painting head comprises a nozzle arrangement (14) with a set of nozzles (16) for depositing paint (30) and a surface measuring system (18) configured to detect the surface, wherein the method comprises: controlling (110) the surface measuring system to detect a presence of the surface within a predefined range (29); and responsive to the detected presence of the surface, controlling (130) the nozzle arrangement to deposit paint at the detected surface.

The utility model relates to the technical field of paint surface measurement, and discloses a Bluetooth-connected paint surface coating thickness measuring device, which comprises a springback mechanism, an outer shell, a paint surface measuring module arranged in the outer shell and a probe monitoring assembly electrically and fixedly connected to one side of the paint surface measuring module. The protection assembly comprises a sleeve connected to the outer portion of the outer shell in a threaded mode, a bearing frame fixedly connected to the interior of the sleeve, and an amplification assembly fixedly connected to one end of the bearing frame. According to the utility model, after the sleeve and the external thread groove at one end are spirally taken down, the bearing bracket can be driven to be separated from the elastic abutting of the probe monitoring assembly along with continuous outward rotation of the sleeve, so that the probe monitoring assembly separated from the abutting limit of the bearing bracket can be elastically extended, and then the probe monitoring assembly is electrically contacted with the paint surface measuring module, and automatic starting of the device is realized; the detection use efficiency is improved.

The utility model discloses a handheld contourgraph measurement auxiliary tool which comprises a contourgraph body, a laser measurement assembly used for emitting laser and measuring the surface of an object is installed on the contourgraph body, and an installation rod is movably installed on the top of the contourgraph body. The mounting rod and the contourgraph body are rotationally arranged, a connecting rod is rotationally mounted at the top of the mounting rod, a handheld rod is rotationally mounted at the end, away from the mounting rod, of the connecting rod, the mounting rod, the connecting rod and the handheld rod form an auxiliary frame, and the auxiliary frame and the contourgraph body are disassembled and assembled. The contourgraph is used for improving the convenience of the contourgraph body, all-directional rotation of the contourgraph body is achieved by driving the contourgraph body to rotate on the X and Y faces, the Z and Y faces and the Z and X faces, and all-directional measurement and use of the auxiliary frame and the contourgraph body on the surface of an object can be facilitated.

This invention relates to the field of measurement platform technology, specifically a measurement platform with a leveling system, comprising: a base, a support frame fixed to the surface of the base, an adjustment seat provided on the surface of the support frame, a flip plate provided on the surface of the adjustment seat, a fixing ring provided on the surface of the flip plate, a first crossbar inserted into the end of the flip plate, a second crossbar fixed to the other end of the first crossbar, a nut provided on the surface of the second crossbar, a horizontal plate provided on the surface of the second crossbar, a connecting rod fixed to the end of the horizontal plate, and a pressing block provided at the other end of the connecting rod; the beneficial effect is that after the horizontal plate is pushed by the nut, it moves against the direction of the adjustment seat, and the horizontal plate drives the pressing block to move through the connecting rod, and the pressing block presses down on the surface of the force-bearing rod, so that the two sets of force-bearing rods drive the flip plate to stabilize on the surface of the adjustment seat, and the position of the fixing ring can also be stabilized when the measuring instrument is fixed on the surface of the fixing ring.

The off-focus holographic measurement method of the planet zoom-based radio telescope of the application carries out off-focus observation on a planet as a source, obtains an actual observed beam pattern of the planet through deconvolution, establishes a theoretical far-field model of the planet, compares the theoretical far-field model of the planet with the actually observed beam pattern to calculate a redundancy value, continuously updates coefficients of Zernike polynomials through minimization of the redundancy value and iteration until an optimal phase model is determined, and determines a phase error on an aperture plane according to the phase model. The off-focus holographic measurement method of the application introduces a planet as a radio source, not only improves measurement accuracy and stability, but also enhances real-time measurement effect and multi-frequency calibration capability, significantly improves calibration accuracy and overall performance of the Tianma radio telescope, and solves many limitations of traditional surface measurement methods, such as slow measurement speed, need of additional hardware devices, great influence of weather, limited application range and the like.